How do I write the formula for the following, Lithium nitride, barium nitrate iron(II) Sulfate and Chromium(III) oxide? Also what is the difference between nitride and nitrate? I am not only asking for a straight answer but an explanation too! Thanks
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illuminati
ANSWERS: 1
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Nitride is a nitrogen atome with three extra electrons, hence nitride is N (3-) Nitrate is an ion consisting of one nitrogen atom and three oxygen atoms, and has a charge of -1. Hence NO3 (1-) Sulfate is SO4 (2-), oxide is O (2-) Lithium is a metal-ion, charge =1; baro=ium +2, Iron(II) of course has a charge of +2, and Chromium(III) +3. When writing down the formlua of an ionic compound, one must always make sure that the charges (positive and negative) match. When necessary, correct by multiplying the amount of individual ions. So: Li3N (balancing a -3 charge on the nitrogen with three +1 charge on the Lithium) Ba(NO3)2 +2 vs two times -1 FeSO4 nicely +2 vs -2 Cr2O3 is 2 times 3+ (= 6+) against 3 times -2 (-6)
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